fixing a steel floor

[thailoz]

Ok I know I am ways away yet but trying to plan ahead I am going to use a steel floor

I was thinking 1 mm thick reason is mostly cost. 2mm Ali is nearly £100 a sheet here

I don't want to weld as I am worried about it looking like the ocean waves when finished ,
so I was thinking about riveting it that way I could use galvanized steel .

Would I require any special rivets ?